Measurement of the top quark mass in final states with two leptons

Abstract

We present measurements of the top quark mass in ttbar candidate events with two final state leptons using 1 inverse fb of data collected by the D0 experiment. Our data sample is selected by requiring two fully identified leptons or by relaxing one lepton requirement to an isolated track if at least one jet is tagged as a b jet. The top quark mass is extracted after reconstructing the event kinematics under the ttbar hypothesis using two methods. In the first method, we integrate over expected neutrino rapidity distributions, and in the second we calculate a weight for the possible top quark masses based on the observed particle momenta and the known parton distribution functions. We analyze 83 candidate events in data and obtain m_t = 176.2 +/- 4.8 (stat) +/- 2.1 (sys) GeV and m_t = 173.2 +/- 4.9 (stat) +/- 2.0 (sys) GeV for the two methods, respectively. Accounting for correlations between the two methods, we combine the measurements to obtain m_t = 174.7 +/- 4.4 (stat) +/- 2.0 (sys) GeV.

22 pages, 11 figures, subm. to Phys. Rev. D

References in corpus (4)

• Measurement of the inclusive jet cross section in $p\bar{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$
• Measurement of the shape of the boson transverse momentum distribution in ppbar -> Z/gamma* -> ee+X events produced at sqrt{s}=1.96 TeV
• Precise measurement of the top quark mass from lepton+jets events at D0
• Measurement of the ttbar production cross section and top quark mass extraction using dilepton events in ppbar collisions

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• Next-to-leading order QCD corrections to s-channel single top quark production and decay at the LHC
• Reducing combinatorial uncertainties: A new technique based on MT2 variables
• Precise measurement of the top quark mass in the dilepton channel at D0
• Top Quark Mass Measurement using mT2 in the Dilepton Channel at CDF
• Measurement of the top quark mass in $\boldsymbol{\ppbar}$ collisions using events with two leptons
• Precise measurement of the top quark mass in dilepton decays using optimized neutrino weighting
• Precision measurements of the top quark mass from the Tevatron in the pre-LHC era
• Top Quark Physics at the Tevatron
• Properties of the Top Quark